Cylindrical grinding-machine.



C. H. NORTON.

- OYLINDEIOAL GRINDING MACHINE.

, APPLICATION IILED- MAR. 20, 1912.

Patented Dec. 3, 1912.

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O. H. NORTON.

OYLINDRIGAL GRINDING MACHINE.

APPLICATION FILED I\IAR.20,1912.

L0%5,'?7, Patented Dec. 3, 191.2

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CHARLES H. NORTON, or wonons'rnn, MASSACHUSETTS, ASSIGNOR '10 NORTON GRINDING COMPANY, or wonons'rnn, MASSACHUSETTS, A CORPORATION or MASSACHUSETTS,

CYLINDRIGAL GRINDING MACHINE.

Application filed March 20, 1912. Serial No. 685,074.

To all whom it may concern:

Be it known that L-OHARLES H. NORTON, a citizen of the United States, residing at Worcester, in the county of Worcester and State of- Massachusetts, haveinvented a new.

and useful Cylindrical Grinding Machine,

of which'the following is aspecification.

This invention relatesto that class of cylindrical grinding machines in which the grinding wheel is bodily movable toward and from the work. Ordinarily these machines have been so constructed that the wheel was moved back and forth by hand.

Theprincipal objects of this invention are to provide a simple and convenient means for operating the wheel, either by hand or power, at will; to provide a construction in which the hand operated mechanism can be disconnected very readily from the wheel operating mechanism when it is to be operated by power; and especially to provide a simple and effective means whereby when the wheel hasbeen brought up by. power to the limiting position it cannot be moved farther in that direction by power, until the machine is reset, so that danger of bringing it too far up after truing. the wheel or replacing it is avoided.

The invention also involves improvements in combinations of parts and details of construction as will appear hereinafter.

Reference is to be had to the accompanying drawings, in which- Figure l is an elevation of a wheel case showing the wheel in contact with the work.

Fig. 2 is a transverse sectional view through the wheel operating shaft and connected parts, and Fig. 3 is an elevation of the same partly in section.

The invention is shown as applied to a machine in which the work A is operated upon by a rotary grinding wheel B arranged in a casing the invention can be used on any ordinary wheel and wheel casing are moved very slowly toward and from the work by an arrangement comprising a rotary handle 10, a long-faced pinion 13 and a gear 14 on a shaft 15 which carries a worm 16 for moving the casing C back and forth. Ordi- Specification of Letters Patent.

C. The means for rotating the grinding wheel are not illustrated herein as tates.

Patented Dec. 3, 1912.

narily this gear 14 is connected directly with the shaft, but in this case these connections are modified as will appear hereinafter.

' Thepower operating means for moving the casing C is shown as comprising a handle 20 on anoscillatable shaft 21 which is provided with a lever 22 connected with a reciprocable rod 23 carrying springs 24 and an operating member 25 for operating a double faced clutch'26. This clutch is designed to connectv the feed driveshaft 27 with a shaft 28 through a set of bevel gears 29 for the purpose .ofjrot a t-ing. the shaft 28 in either direction from thefee'd drive shaft.

This shaft 28-is connected by any suitable gearing 29 with the'shaft 15. i'

It will be seen, therefore',""tliat by the mechanism so far described, the shaft 15 can be rotated in either direction "byt he power or by hand, independently 'of each other. The shaft 15 is connected witht wheel 14 by a hub 30'keyed to the shaft rotatably IfiOllIltGCl thereon a bushing 31 for the hub of the gear and provided with a pair of circumferential grooves '32. Radial ins 33 in the hub of the gear 14 are pressed lnwardly by a circumferential spring 34 so as to engage in either'one of said grooves. The gear is provided with a projecting flange 35 adapted to be grasped by the hand for the purpose of moving the gear back and forth so as to bring it into either of its two positions on the bushing 31. In the position shown in the drawings, teeth 36 on the hub of the gear engage between teeth 37 on the hub 30 and consequently the rotation of the pinion 13 is transmitted positively to the shaft 15 or vice versa. But when the flange 35 is pulled backso that the pins 33 engage in the other groove 32, there is no engagement between these teeth and consequently the shaft 15 can operate without .spinning the rotary handle 10 around.

On the hub 30 is arranged a bushing 38 by means of a screw or the like 38 on which is carried a pinion 39. This pinion meshes with two gears 40 and 41. One 'of-these gears 40 is fixed with respect to a bearing 42 on the frame in which the shaft 15 ro- The other gear 41 is rotatable on this bearing and carries with it a larger gear 43. The two gears 40 and 41 are of when the wheel comes back to its original the same size so that they can both mesh with the, pinion 39, but they are provided with different numbers of teeth. Preferably one of them has one more tooth than the other. The gear 43 meshes with a gear 44 which is mounted to rotate freely on a bearing 45 on the frame, this hearing being concentric with the gear 13, preferably. This gear 44 is provided with a conical friction surface 46 which is engaged by a similar s'urface47 on a wheel 48 also free to rotate on the hub of the gear 44. 'This hub is pro vided with screw-threads on which is a pilot wheel 49 adapted to screw up on the threads and force the wheel 48 inwardly so as to cause the two friction surfaces to engage each other firmly and cause the gear 44 and wheel 48 to rotate together. On the wheel 48 is a block 50 which, when in one position, ngages a sliding rod 51 mounted in a bearing 52 of the frame and moves it into a position in which it will engage a projection 53 .on the shaft 21 and prevent the movement of this shaft beyond the center of its oscillation. That is, it will prevent the handle 20 being turned to a position to connect the clutch 26 with the shaft 27 to rotate the shaft 15 in one direction, that is the direction to move the wheel toward the work. On both the wheel 48 and a concentric surface of the frame are permanent marks as 54 and 55. Now when the grinding wheel has been brought up to position toward the work, and has to be withdrawn for truing up or any other purpose, it is obvious that it will be necessary to bring the wheel back exactly to the same point. Consequently, the operator loosens the pilot wheel 49 and turns the wheel 48 until the marks 54 and 55 register. Then the block 50 comes into the position shown in Fig. 3 and just above described. Then he tightens up the pilot wheel. This having been done it will be obvious, first that the grinding wheel cannot be moved any farther toward the work by power on account of the position of the parts 50, 51 and 52, and second, that when it has been moved away from the workand then brought up again, the block 50 will always come back to this position extreme position. In this way it will be seenthat after the machine is once set, there is no danger of the operator bringing the grinding wheel up too far by power or of stopping short of the properposition' to commence to finish the work. As has been stated, when reciprocatingthe grinding wheel by power, the spinning around of the rotary handle can be prevented simply by pulling out the flange 35.

1 Although I have illustrated and described only a single form of the invention and shown as applied only to a single type of grinding machines, I am aware that the inventio isicapable of being carried out in mar other ways and applied to practically :1 11 types of grinding machines and therefore ILl) do not wish to be limited in these respects,

What I do claim is 1. In a cylindrical grinding machine. the combination with a bodi v movable grinding wheel, of power operated means for moving it toward and from the work, a movable stop for preventing the operation of the power operated means in one dire tion, and means for operating the stop whenever the wheel reaches a predetermined position, for disconnecting the wheel from the power.

p 2. In a cylindrical grinding machine," the combination with a bodily movable grinding wheel, of power operated means for moving it toward and from the work, a double faced clutch for connecting the wheel with said power operated means, and means for preventing the operation of the clutch in one direction. l

3. In a cylindrical grinding machine, the combination with a grinding wheel movable toward and from the work, of means adapted to be set when the wheel is at one extreme, and means for returning said means to its set position whenever the wheel returns to said extreme position for preventing the wheel from moving beyond that extreme.

4. In a cylindrical grinding machine, the combination with a grinding wheel movable toward and from the work, of means for moving said wheel in either direction, means adapted to be set when the wheel is at one extreme for preventing the wheel from mow ing beyond that extreme on any subsequent operation, said means comprising a movable member which when so set prevents the operation of said wheel moving means in one direction, and means for bringing said movable means back to the same position whenever the' wheel is in the same extreme position.

5. In a cylindrical grinding machine, the combination with a movable grinding wheel, of a feed drive shaft, a shaft for moving said wheel, means for transmitting power in either direction to .the last named shaftfrom the feed drive shaft, said means com-- prising a double faced clutch, hand operated means for operating the double faced clutch,

tion when said second shaft has turned to a position to bring the wheel'into a predetermined extreme position.

7. In a cylindrical grinding machine, the

combination with a grinding wheel movable in prising a shaft for moving the wheel, a

wheel rotatable by said shaft and having a friction surface, a wheel having a friction surface adapted to 'engagethe first named friction surface and rotate therewith, and means rotatable with the last named Wheel for preventing the motion of the grinding wheel beyonda predetermined point in one direction.

8. In a cylindrical grinding machine, the combination of a bodily movable grinding whe'el, a shaft for moving the grinding wheel, differential gearing connected with said shaft, a gear operated by said gearing, a wheel rotatable on'the same axis as said gear, and havin means for limiting the motion of the grlnding wheel in one direction, and means for'clamping said rotatable ed to set when the wheel is at one extreme for preventing the wheel from moving beyond that extreme on any subsequent operation, hand operated means for independ: ently moving the grinding Wheel, and means for disconnecting the hand operated means from. the grinding wheel.

10. In a cylindrical grinding machine, the combination with a bodily movable grinding wheel,'of means for moving the grinding wheel by hand, means for moving the grinding wheel by power, and means for disconnecting the hand operating means from the grinding wheel. a

11. In a cylindrical grinding machine, the

combination with a bodily movable grind- 7 ing wheel, of means for moving the grinding wheel by hand, means for moving the grinding Wheel by power, means for disconnecting the hand operating means from the grinding wheel, means for disconnecting the power, operating means from the grinding wheel, and means for connecting the proper operated means to move the wheel in either direction.

In testimony whereof I have hereunto set my hand, in the presence 'of two sub scribing witnesses.

CHARLES H. NORTGN. Witnesses:

ALBERT E. FAY, O, FonREs'r WEssoN'. 

